Hello and welcome to JustAnswer!
What year is your van?
Do you have power sliding doors on one side of the van, or both? If you have power sliding doors on both sides, have you checked to see if the other one still works or if it's stopped now too?
If the door is closed and you try to open it electrically what exactly does it do? Does absolutely nothing happen?
Does the latch pop off but the door doesn't move electrically?
What kind of noises do you hear?
If you open the door all the way by hand and then try to close it electrically what does it do?
When you initially tried it and the latch popped off but the door didn't move, after the latch popped off did you still hear what sounded like a motor running inside the door?
Let's try disconnecting the battery for a minute and then see what happens when you try to open or close it electrically. Disconnecting the battery will clear any fault codes stored in the power sliding door module and will allow it to try and work again hopefully. It may have disabled the electrical functions, being that you have a couple of different symptoms. If the door does try to work again, note exactly what it does and let me know and we'll go from there.
What click noise?
Is it the lock solenoid, and when you hear the click you see the lock rod jump up?
Is it the latch clicking, but the door doesn't pop off?
Is it the latch popping off, but the door doesn't move afterward?
Does the latch pop off, the motor runs, but you get a constant clicking from the motor?
None of the above? If not, please describe where the noise is coming from, how many clicks, etc.
Unlock the doors and make sure all doors are closed. Turn the key off and make sure the interior lights are off. Then open the sliding door by hand and see if the interior lights come back on when you do.
That tells us that the power sliding door module on that door is not functional, which is why the door also won't open. It may take some electrical testing at the module to determine why it's not functional. The most common cause for this would be a broken wire in the wiring harness that runs to the door. In the lower opening under the door you will see the black plastic chain that runs between the body and the door, in this chain is the wiring harness. Each time the door opens or closes the wiring inside flexes and can eventually break. Most common is a broken power or ground wire that feeds the door module, which takes it down and the door will not open electrically.
Take a close look at the wires in this harness and see if any are broken. If you find some broken you can either replace the harness or open it up and repair the problem area.
If you can't see any broken wires visually then it will take some electrical testing with a voltmeter or test light to determine exactly what is going on, which I could help you with if needed.
in the harness of wires ...what color is the power wire and the ground? So I can test those first?